Yup. In terms of open source ones, there isn't really any alternative. As proprietary products, the TopQuadrant suite of tools is sometimes used, and isn't as b

Yup. In terms of open source ones, there isn't really any alternative. As proprietary products, the TopQuadrant suite of tools is sometimes used, and isn't as bug heavy, but it still leaves a lot to be desired. One of the issues that a lot of editors of intermediate ontology projects face, is that they have to overcome the limitations of the commonly used frameworks (like SKOS and OWL), and create new primitives for their domain. However to really leverage those constructs you'd have to have a good editor integration, otherwise you are left to express the same constructs out of atomic triples again and again. At that point it often becomes easier to just work in Turtle and copy-paste those constructs.